DSP Robotics Support

Hi all,

I'm trying to get back into Flowstone and hence grabbed an old project from 2018 or so.

It was made in version 3.06 and Spogg at the time had considerable input on what to do, respectively he thankfully changed a lot of stuff and added comments (included in schematic).

The initial concept was sort of heavy on the cpu, so I trimmed down some of the aspects I then wanted to achieve.

The idea now is to have basically two things:

1. A "dynamic" filter which is modulated in cut-off and resonance by an LFO.

2. A "static" filter bank which can be blended with 1 and again the mixer is modulated by an LFO.

Some sounds which come out of it are, err, interesting. When you move the sliders, however, scratch-hell breaks loose.

I'd be happy about and thankful for any input on what to do.

Since I can't buy the 64-bit version, I'm still sticking with the 3.06.

Thank you + best regards, Phil

Hey Phil, I have two hints to possible issues:
1. Audio adapters do not like values outside the +-1 range at all. It is a good idea to put a clipper at the end of the audio signal chain. Here are some master volume knobs with integrated clippers and clipping indicators that I routinely use.
2. Many recursive filters, in particular direct form implementations, do not cope well with fast parameter changes (modulation). In the worst case this can lead to lock-ups and completely shut down the audio stream. So be careful with discontinuities in the modulation (sawtooth, square, etc.), or use filters which can handle it (like zero delay feedback).
Hope that helps!

Hello Martin and thank you!

I did reduce the number of filters, eliminating those which lead to slurpy and smacky sounds and added your mono-clipper. That seems to have done the trick.

Even with saw and triangle modulation I cannot notice any unpleasant outcomes. I'm glad you helped out, thanks again and have a good day.

Best regards, Phil